Acquisitions (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	May 31, 2024	Jun. 30, 2024		Jun. 30, 2024		Dec. 31, 2023	Sep. 30, 2023	Jul. 01, 2023
Business Acquisition [Line Items]
Goodwill		$ 19,833	[1]	$ 19,833	[1]	$ 19,686
Other intangible assets		$ 6,619		$ 6,619		$ 6,775
Huatai Group
Business Acquisition [Line Items]
Subsidiary, Ownership Percentage, Parent		85.50%		85.50%		76.50%		69.60%
Additional 9.0 percent ownership interest obtained in subsidiary		9.00%
Outstanding 0.6 percent additional ownership interest agreed on		0.60%		0.60%
Huatai Group
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage							64.20%
Huatai Group
Business Acquisition [Line Items]
Payments to Acquire Additional Interest in Subsidiaries				$ 236
Deposits previously paid on additional ownership interest obtained		$ 319
Deposits previously paid on additional ownership interest agreed on		12		12
Outstanding payment to be made on additional ownership interest agreed on		24		$ 24
Payment on additional ownership interest obtained, including deposits previously paid		$ 555
Goodwill								$ 3,458
Other intangible assets								$ 1,655
healthy paws
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 300
Goodwill	256
Other intangible assets	$ 39

[1] Includes $500 million attributable to noncontrolling interests.